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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd3a9f3dd6b8f1fe373e87a10093a776214799c23cc61a630dd3d2012933b9f5c' 
  AND token = 'GYGgHsEUiVOIBpqJM1+THp2m+UvWyeUb16dEdHsOkgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01482

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}